Originally Posted by 52larry52

Both John Buckner and Jester_s1 are correct in offering an inverted @ 45* angle for the engine. I didn't think of that option at the time but it does work well especially because you are kit building and can build the exhaust tunnel as part of the construction not as a modification on an ARF. Easier to do it up front not after the fuselage is already ARF built. More work but you don't have to spend $35 or so on a special muffler. Your choice. Jester gave you more details on what it takes to break in a Super Tiger. If you want to go through that, "knock yourself out". I have, in my old lazy years, taken to the "smooth and easy" route in doing things and an O.S. would sure be smoother and easier. But if your into pain and frustration go ahead and use that almost "free" S.T. I have several Super Tigers in various planes (not in any Cubs) and learned to tune them and so can you, it's just not the easy route. Either way, have fun.